1240915674978 has 32 divisors (see below), whose sum is σ = 3151531873920. Its totient is φ = 354547335600.

The previous prime is 1240915674949. The next prime is 1240915674979. The reversal of 1240915674978 is 8794765190421.

1240915674978 is a `hidden beast` number, since 1 + 2 + 4 + 0 + 91 + 56 + 7 + 497 + 8 = 666.

It is a super-2 number, since 2×1240915674978² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1240915674979) 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, 1641422473 + ... + 1641423228.

It is an arithmetic number, because the mean of its divisors is an integer number (98485371060).

Almost surely, 2^{1240915674978} is an apocalyptic number.

1240915674978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1240915674978 is an abundant number, since it is smaller than the sum of its proper divisors (1910616198942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1240915674978 is a wasteful number, since it uses less digits than its factorization.

1240915674978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282845719 (or 3282845713 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 1240915674978 in words is "one trillion, two hundred forty billion, nine hundred fifteen million, six hundred seventy-four thousand, nine hundred seventy-eight".