156121420 has 48 divisors (see below), whose sum is σ = 403518528. Its totient is φ = 49409280.

The previous prime is 156121393. The next prime is 156121429. The reversal of 156121420 is 24121651.

It is a junction number, because it is equal to n+sod(n) for n = 156121391 and 156121400.

It is not an unprimeable number, because it can be changed into a prime (156121429) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 41071 + ... + 44710.

It is an arithmetic number, because the mean of its divisors is an integer number (8406636).

Almost surely, 2^156121420 is an apocalyptic number.

156121420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156121420 is an abundant number, since it is smaller than the sum of its proper divisors (247397108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

156121420 is a wasteful number, since it uses less digits than its factorization.

156121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85810 (or 85808 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 156121420 is about 12494.8557414642. The cubic root of 156121420 is about 538.4608894498.

The spelling of 156121420 in words is "one hundred fifty-six million, one hundred twenty-one thousand, four hundred twenty".