1240379553 has 32 divisors (see below), whose sum is σ = 1919324160. Its totient is φ = 697881600.

The previous prime is 1240379531. The next prime is 1240379579. The reversal of 1240379553 is 3559730421.

It is a happy number.

It is not a de Polignac number, because 1240379553 - 2⁵ = 1240379521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240379513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 773953 + ... + 775553.

It is an arithmetic number, because the mean of its divisors is an integer number (59978880).

Almost surely, 2^1240379553 is an apocalyptic number.

It is an amenable number.

1240379553 is a deficient number, since it is larger than the sum of its proper divisors (678944607).

1240379553 is a wasteful number, since it uses less digits than its factorization.

1240379553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 1240379553 is about 35219.0226014295. The cubic root of 1240379553 is about 1074.4466748225.

The spelling of 1240379553 in words is "one billion, two hundred forty million, three hundred seventy-nine thousand, five hundred fifty-three".