1990363957 has 2 divisors, whose sum is σ = 1990363958. Its totient is φ = 1990363956.

The previous prime is 1990363909. The next prime is 1990363967. The reversal of 1990363957 is 7593630991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1641384196 + 348979761 = 40514^2 + 18681^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990363957 - 2²³ = 1981975349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990363967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995181978 + 995181979.

It is an arithmetic number, because the mean of its divisors is an integer number (995181979).

Almost surely, 2^1990363957 is an apocalyptic number.

It is an amenable number.

1990363957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990363957 is an equidigital number, since it uses as much as digits as its factorization.

1990363957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1377810, while the sum is 52.

The square root of 1990363957 is about 44613.4952340657. The cubic root of 1990363957 is about 1257.8943492702.

The spelling of 1990363957 in words is "one billion, nine hundred ninety million, three hundred sixty-three thousand, nine hundred fifty-seven".