153621972 has 72 divisors (see below), whose sum is σ = 454149696. Its totient is φ = 42868224.

The previous prime is 153621971. The next prime is 153621977. The reversal of 153621972 is 279126351.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153621971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3748 + ... + 17924.

Almost surely, 2^153621972 is an apocalyptic number.

153621972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 153621972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227074848).

153621972 is an abundant number, since it is smaller than the sum of its proper divisors (300527724).

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

153621972 is a wasteful number, since it uses less digits than its factorization.

153621972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14237 (or 14232 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 153621972 is about 12394.4331052291. The cubic root of 153621972 is about 535.5718949260.

The spelling of 153621972 in words is "one hundred fifty-three million, six hundred twenty-one thousand, nine hundred seventy-two".