1955390972 has 6 divisors (see below), whose sum is σ = 3421934208. Its totient is φ = 977695484.

The previous prime is 1955390971. The next prime is 1955390981. The reversal of 1955390972 is 2790935591.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1955390972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955390971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244423868 + ... + 244423875.

It is an arithmetic number, because the mean of its divisors is an integer number (570322368).

Almost surely, 2^1955390972 is an apocalyptic number.

It is an amenable number.

1955390972 is a deficient number, since it is larger than the sum of its proper divisors (1466543236).

1955390972 is a wasteful number, since it uses less digits than its factorization.

1955390972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488847747 (or 488847745 counting only the distinct ones).

The product of its (nonzero) digits is 765450, while the sum is 50.

The square root of 1955390972 is about 44219.8029394071. The cubic root of 1955390972 is about 1250.4832205343.

The spelling of 1955390972 in words is "one billion, nine hundred fifty-five million, three hundred ninety thousand, nine hundred seventy-two".