1955942640 has 100 divisors (see below), whose sum is σ = 6793301064. Its totient is φ = 521582976.

The previous prime is 1955942627. The next prime is 1955942657. The reversal of 1955942640 is 462495591.

1955942640 is a `hidden beast` number, since 19 + 5 + 594 + 2 + 6 + 40 = 666.

It is a super-2 number, since 2×1955942640² = 7651423221940339200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 144442 + ... + 157401.

Almost surely, 2^1955942640 is an apocalyptic number.

1955942640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1955942640 is an abundant number, since it is smaller than the sum of its proper divisors (4837358424).

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

1955942640 is a wasteful number, since it uses less digits than its factorization.

1955942640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301868 (or 301853 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 1955942640 is about 44226.0402930219. The cubic root of 1955942640 is about 1250.6008077111.

The spelling of 1955942640 in words is "one billion, nine hundred fifty-five million, nine hundred forty-two thousand, six hundred forty".