1258977945 has 16 divisors (see below), whose sum is σ = 2014805952. Its totient is φ = 671307840.

The previous prime is 1258977877. The next prime is 1258977949. The reversal of 1258977945 is 5497798521.

It is not a de Polignac number, because 1258977945 - 2⁷ = 1258977817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1258977949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121675 + ... + 131615.

It is an arithmetic number, because the mean of its divisors is an integer number (125925372).

Almost surely, 2^1258977945 is an apocalyptic number.

1258977945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1258977945 is a deficient number, since it is larger than the sum of its proper divisors (755828007).

1258977945 is an equidigital number, since it uses as much as digits as its factorization.

1258977945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18392.

The product of its digits is 6350400, while the sum is 57.

The square root of 1258977945 is about 35482.0792090881. The cubic root of 1258977945 is about 1079.7901812905.

The spelling of 1258977945 in words is "one billion, two hundred fifty-eight million, nine hundred seventy-seven thousand, nine hundred forty-five".