1620157 has 16 divisors (see below), whose sum is σ = 2063232. Its totient is φ = 1235520.

The previous prime is 1620133. The next prime is 1620161. The reversal of 1620157 is 7510261.

It is not a de Polignac number, because 1620157 - 2¹⁵ = 1587389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620107) 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, 3883 + ... + 4279.

It is an arithmetic number, because the mean of its divisors is an integer number (128952).

2^1620157 is an apocalyptic number.

It is an amenable number.

1620157 is a deficient number, since it is larger than the sum of its proper divisors (443075).

1620157 is a wasteful number, since it uses less digits than its factorization.

1620157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1620157 is about 1272.8538800664. The cubic root of 1620157 is about 117.4498231509.

The spelling of 1620157 in words is "one million, six hundred twenty thousand, one hundred fifty-seven".