1520232440 has 32 divisors (see below), whose sum is σ = 3503954160. Its totient is φ = 593260800.

The previous prime is 1520232433. The next prime is 1520232451. The reversal of 1520232440 is 442320251.

It is a happy number.

It is a super-2 number, since 2×1520232440² = 4622213343256707200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461846 + ... + 465125.

Almost surely, 2^1520232440 is an apocalyptic number.

1520232440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1520232440 is an abundant number, since it is smaller than the sum of its proper divisors (1983721720).

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

1520232440 is a wasteful number, since it uses less digits than its factorization.

1520232440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927023 (or 927019 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 1520232440 is about 38990.1582453829. The cubic root of 1520232440 is about 1149.8380212946.

Adding to 1520232440 its reverse (442320251), we get a palindrome (1962552691).

The spelling of 1520232440 in words is "one billion, five hundred twenty million, two hundred thirty-two thousand, four hundred forty".