1556145 has 16 divisors (see below), whose sum is σ = 2766720. Its totient is φ = 829872.

The previous prime is 1556117. The next prime is 1556147. The reversal of 1556145 is 5416551.

It is a happy number.

It is not a de Polignac number, because 1556145 - 2⁷ = 1556017 is a prime.

It is a super-2 number, since 2×1556145² = 4843174522050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1556147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5629 + ... + 5898.

It is an arithmetic number, because the mean of its divisors is an integer number (172920).

2^1556145 is an apocalyptic number.

1556145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1556145 is a deficient number, since it is larger than the sum of its proper divisors (1210575).

1556145 is a wasteful number, since it uses less digits than its factorization.

1556145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11541 (or 11535 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1556145 is about 1247.4554100247. The cubic root of 1556145 is about 115.8821881571.

The spelling of 1556145 in words is "one million, five hundred fifty-six thousand, one hundred forty-five".