1520342440 has 16 divisors (see below), whose sum is σ = 3420770580. Its totient is φ = 608136960.

The previous prime is 1520342431. The next prime is 1520342459. The reversal of 1520342440 is 442430251.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1414211236 + 106131204 = 37606^2 + 10302^2 .

It is a super-2 number, since 2×1520342440² = 4622882269730307200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19004241 + ... + 19004320.

Almost surely, 2^1520342440 is an apocalyptic number.

1520342440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1520342440 is an abundant number, since it is smaller than the sum of its proper divisors (1900428140).

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

1520342440 is a wasteful number, since it uses less digits than its factorization.

1520342440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38008572 (or 38008568 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 1520342440 is about 38991.5688322489. The cubic root of 1520342440 is about 1149.8657537054.

Adding to 1520342440 its reverse (442430251), we get a palindrome (1962772691).

The spelling of 1520342440 in words is "one billion, five hundred twenty million, three hundred forty-two thousand, four hundred forty".