1972207957 has 4 divisors (see below), whose sum is σ = 1972693900. Its totient is φ = 1971722016.

The previous prime is 1972207921. The next prime is 1972207973. The reversal of 1972207957 is 7597022791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1529904996 + 442302961 = 39114^2 + 21031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1972207957 - 2²³ = 1963819349 is a prime.

It is a super-2 number, since 2×1972207957² = 7779208451308227698, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1972207957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1972207997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236832 + ... + 245017.

It is an arithmetic number, because the mean of its divisors is an integer number (493173475).

Almost surely, 2^1972207957 is an apocalyptic number.

It is an amenable number.

1972207957 is a deficient number, since it is larger than the sum of its proper divisors (485943).

1972207957 is an equidigital number, since it uses as much as digits as its factorization.

1972207957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485942.

The product of its (nonzero) digits is 555660, while the sum is 49.

The square root of 1972207957 is about 44409.5480386820. The cubic root of 1972207957 is about 1254.0578436960.

The spelling of 1972207957 in words is "one billion, nine hundred seventy-two million, two hundred seven thousand, nine hundred fifty-seven".