1521164040 has 64 divisors (see below), whose sum is σ = 4978359360. Its totient is φ = 368766720.

The previous prime is 1521164027. The next prime is 1521164053. The reversal of 1521164040 is 404611251.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1521164027) and next prime (1521164053).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1521164040.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574879 + ... + 577518.

It is an arithmetic number, because the mean of its divisors is an integer number (77786865).

Almost surely, 2^1521164040 is an apocalyptic number.

1521164040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521164040 is an abundant number, since it is smaller than the sum of its proper divisors (3457195320).

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

1521164040 is a wasteful number, since it uses less digits than its factorization.

1521164040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152422 (or 1152418 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1521164040 is about 39002.1030202219. The cubic root of 1521164040 is about 1150.0728473072.

Adding to 1521164040 its reverse (404611251), we get a palindrome (1925775291).

It can be divided in two parts, 1521 and 164040, that added together give a palindrome (165561).

The spelling of 1521164040 in words is "one billion, five hundred twenty-one million, one hundred sixty-four thousand, forty".