1816920157 has 8 divisors (see below), whose sum is σ = 1962979200. Its totient is φ = 1671760560.

The previous prime is 1816920143. The next prime is 1816920221. The reversal of 1816920157 is 7510296181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1816920157 - 2¹¹ = 1816918109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816929157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220657 + ... + 228742.

It is an arithmetic number, because the mean of its divisors is an integer number (245372400).

Almost surely, 2^1816920157 is an apocalyptic number.

It is an amenable number.

1816920157 is a deficient number, since it is larger than the sum of its proper divisors (146059043).

1816920157 is a wasteful number, since it uses less digits than its factorization.

1816920157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449723.

The product of its (nonzero) digits is 30240, while the sum is 40.

The square root of 1816920157 is about 42625.3464150146. The cubic root of 1816920157 is about 1220.2400667502.

The spelling of 1816920157 in words is "one billion, eight hundred sixteen million, nine hundred twenty thousand, one hundred fifty-seven".