1958432257 has 4 divisors (see below), whose sum is σ = 1958804820. Its totient is φ = 1958059696.

The previous prime is 1958432243. The next prime is 1958432261. The reversal of 1958432257 is 7522348591.

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 932447296 + 1025984961 = 30536^2 + 32031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1958432257 - 2¹⁵ = 1958399489 is a prime.

It is a super-2 number, since 2×1958432257² = 7670913810516228098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1958436257) 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, 178282 + ... + 188947.

It is an arithmetic number, because the mean of its divisors is an integer number (489701205).

Almost surely, 2^1958432257 is an apocalyptic number.

It is an amenable number.

1958432257 is a deficient number, since it is larger than the sum of its proper divisors (372563).

1958432257 is an equidigital number, since it uses as much as digits as its factorization.

1958432257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372562.

The product of its digits is 604800, while the sum is 46.

The square root of 1958432257 is about 44254.1778479727. The cubic root of 1958432257 is about 1251.1311908437.

The spelling of 1958432257 in words is "one billion, nine hundred fifty-eight million, four hundred thirty-two thousand, two hundred fifty-seven".