1540400250 has 64 divisors (see below), whose sum is σ = 3977475840. Its totient is φ = 396603200.

The previous prime is 1540400249. The next prime is 1540400273. The reversal of 1540400250 is 520040451.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13662 + ... + 57161.

It is an arithmetic number, because the mean of its divisors is an integer number (62148060).

Almost surely, 2^1540400250 is an apocalyptic number.

1540400250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1540400250 is an abundant number, since it is smaller than the sum of its proper divisors (2437075590).

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

1540400250 is a wasteful number, since it uses less digits than its factorization.

1540400250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70872 (or 70862 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1540400250 is about 39247.9330665960. The cubic root of 1540400250 is about 1154.9003868290.

The spelling of 1540400250 in words is "one billion, five hundred forty million, four hundred thousand, two hundred fifty".