2145428 has 6 divisors (see below), whose sum is σ = 3754506. Its totient is φ = 1072712.

The previous prime is 2145421. The next prime is 2145433. The reversal of 2145428 is 8245412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1227664 + 917764 = 1108^2 + 958^2 .

It is a super-2 number, since 2×2145428² = 9205722606368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2145397 and 2145406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268175 + ... + 268182.

It is an arithmetic number, because the mean of its divisors is an integer number (625751).

2^2145428 is an apocalyptic number.

It is an amenable number.

2145428 is a deficient number, since it is larger than the sum of its proper divisors (1609078).

2145428 is a wasteful number, since it uses less digits than its factorization.

2145428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536361 (or 536359 counting only the distinct ones).

The product of its digits is 2560, while the sum is 26.

The square root of 2145428 is about 1464.7279610904. The cubic root of 2145428 is about 128.9747361539.

The spelling of 2145428 in words is "two million, one hundred forty-five thousand, four hundred twenty-eight".