1525421000 has 32 divisors (see below), whose sum is σ = 3569487480. Its totient is φ = 610168000.

The previous prime is 1525420991. The next prime is 1525421017. The reversal of 1525421000 is 1245251.

It can be written as a sum of positive squares in 4 ways, for example, as 1014932164 + 510488836 = 31858^2 + 22594^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 761711 + ... + 763710.

Almost surely, 2^1525421000 is an apocalyptic number.

1525421000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1525421000 is an abundant number, since it is smaller than the sum of its proper divisors (2044066480).

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

1525421000 is a wasteful number, since it uses less digits than its factorization.

1525421000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525442 (or 1525428 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1525421000 is about 39056.6383602071. The cubic root of 1525421000 is about 1151.1446699612.

Adding to 1525421000 its reverse (1245251), we get a palindrome (1526666251).

The spelling of 1525421000 in words is "one billion, five hundred twenty-five million, four hundred twenty-one thousand".