152378721 has 24 divisors (see below), whose sum is σ = 240518304. Its totient is φ = 92194560.

The previous prime is 152378719. The next prime is 152378741. The reversal of 152378721 is 127873251.

It is not a de Polignac number, because 152378721 - 2¹ = 152378719 is a prime.

It is a super-2 number, since 2×152378721² = 46438549227191682, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (152378741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88945 + ... + 90641.

It is an arithmetic number, because the mean of its divisors is an integer number (10021596).

Almost surely, 2^152378721 is an apocalyptic number.

152378721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

152378721 is a deficient number, since it is larger than the sum of its proper divisors (88139583).

152378721 is a wasteful number, since it uses less digits than its factorization.

152378721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621 (or 2618 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 152378721 is about 12344.1776153780. The cubic root of 152378721 is about 534.1231988608.

It can be divided in two parts, 152 and 378721, that added together give a palindrome (378873).

The spelling of 152378721 in words is "one hundred fifty-two million, three hundred seventy-eight thousand, seven hundred twenty-one".