1402128025 has 9 divisors (see below), whose sum is σ = 1738870941. Its totient is φ = 1121552640.

The previous prime is 1402128011. The next prime is 1402128029. The reversal of 1402128025 is 5208212041.

The square root of 1402128025 is 37445.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 26904969 + 1375223056 = 5187^2 + 37084^2 .

It is not a de Polignac number, because 1402128025 - 2⁷ = 1402127897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1402128029) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 183481 + ... + 190969.

Almost surely, 2^1402128025 is an apocalyptic number.

1402128025 is the 37445-th square number.

1402128025 is the 18723-rd centered octagonal number.

It is an amenable number.

1402128025 is a deficient number, since it is larger than the sum of its proper divisors (336742916).

1402128025 is an frugal number, since it uses more digits than its factorization.

1402128025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14988 (or 7494 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The cubic root of 1402128025 is about 1119.2554641932.

Multiplying 1402128025 by its sum of digits (25), we get a square (35053200625 = 187225²).

1402128025 divided by its sum of digits (25) gives a square (56085121 = 7489²).

The spelling of 1402128025 in words is "one billion, four hundred two million, one hundred twenty-eight thousand, twenty-five".