155540986 has 4 divisors (see below), whose sum is σ = 233311482. Its totient is φ = 77770492.

The previous prime is 155540977. The next prime is 155540993. The reversal of 155540986 is 689045551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 155475961 + 65025 = 12469^2 + 255^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38885245 + ... + 38885248.

Almost surely, 2^155540986 is an apocalyptic number.

155540986 is a deficient number, since it is larger than the sum of its proper divisors (77770496).

155540986 is an equidigital number, since it uses as much as digits as its factorization.

155540986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77770495.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 155540986 is about 12471.6071939426. The cubic root of 155540986 is about 537.7927574804.

The spelling of 155540986 in words is "one hundred fifty-five million, five hundred forty thousand, nine hundred eighty-six".