1538621952 has 120 divisors (see below), whose sum is σ = 4768440336. Its totient is φ = 439584768.

The previous prime is 1538621951. The next prime is 1538621983. The reversal of 1538621952 is 2591268351.

It is a super-2 number, since 2×1538621952² = 4734715022352580608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1538621951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65043 + ... + 85485.

Almost surely, 2^1538621952 is an apocalyptic number.

1538621952 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 1538621952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2384220168).

1538621952 is an abundant number, since it is smaller than the sum of its proper divisors (3229818384).

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

1538621952 is an equidigital number, since it uses as much as digits as its factorization.

1538621952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20478 (or 20455 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 1538621952 is about 39225.2718537425. The cubic root of 1538621952 is about 1154.4557950489.

The spelling of 1538621952 in words is "one billion, five hundred thirty-eight million, six hundred twenty-one thousand, nine hundred fifty-two".