1939457640 has 64 divisors (see below), whose sum is σ = 5864232960. Its totient is φ = 513112320.

The previous prime is 1939457629. The next prime is 1939457677. The reversal of 1939457640 is 467549391.

It is a super-2 number, since 2×1939457640² = 7522991874708739200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1939457640.

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, 48391 + ... + 78870.

It is an arithmetic number, because the mean of its divisors is an integer number (91628640).

Almost surely, 2^1939457640 is an apocalyptic number.

1939457640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1939457640 is an abundant number, since it is smaller than the sum of its proper divisors (3924775320).

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

1939457640 is a wasteful number, since it uses less digits than its factorization.

1939457640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127402 (or 127398 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 48.

The square root of 1939457640 is about 44039.2738359751. The cubic root of 1939457640 is about 1247.0774689081.

The spelling of 1939457640 in words is "one billion, nine hundred thirty-nine million, four hundred fifty-seven thousand, six hundred forty".