1257157484 has 24 divisors (see below), whose sum is σ = 2417557968. Its totient is φ = 567261440.

The previous prime is 1257157481. The next prime is 1257157487. The reversal of 1257157484 is 4847517521.

It is an interprime number because it is at equal distance from previous prime (1257157481) and next prime (1257157487).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (1257157481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98249 + ... + 110304.

It is an arithmetic number, because the mean of its divisors is an integer number (100731582).

Almost surely, 2^1257157484 is an apocalyptic number.

It is an amenable number.

1257157484 is a deficient number, since it is larger than the sum of its proper divisors (1160400484).

1257157484 is a wasteful number, since it uses less digits than its factorization.

1257157484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208705 (or 208703 counting only the distinct ones).

The product of its digits is 313600, while the sum is 44.

The square root of 1257157484 is about 35456.4166830209. The cubic root of 1257157484 is about 1079.2694774008.

The spelling of 1257157484 in words is "one billion, two hundred fifty-seven million, one hundred fifty-seven thousand, four hundred eighty-four".