156421954 has 8 divisors (see below), whose sum is σ = 252681660. Its totient is φ = 72194736.

The previous prime is 156421931. The next prime is 156421973. The reversal of 156421954 is 459124651.

It can be written as a sum of positive squares in 2 ways, for example, as 144360225 + 12061729 = 12015^2 + 3473^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3008089 + ... + 3008140.

Almost surely, 2^156421954 is an apocalyptic number.

156421954 is a deficient number, since it is larger than the sum of its proper divisors (96259706).

156421954 is a wasteful number, since it uses less digits than its factorization.

156421954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016244.

The product of its digits is 43200, while the sum is 37.

The square root of 156421954 is about 12506.8762686772. The cubic root of 156421954 is about 538.8061806928.

The spelling of 156421954 in words is "one hundred fifty-six million, four hundred twenty-one thousand, nine hundred fifty-four".