1234978740 has 72 divisors (see below), whose sum is σ = 3751773480. Its totient is φ = 328829184.

The previous prime is 1234978669. The next prime is 1234978763. The reversal of 1234978740 is 478794321.

It can be written as a sum of positive squares in 4 ways, for example, as 53406864 + 1181571876 = 7308^2 + 34374^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122782 + ... + 132458.

It is an arithmetic number, because the mean of its divisors is an integer number (52107965).

Almost surely, 2^1234978740 is an apocalyptic number.

1234978740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1234978740 is an abundant number, since it is smaller than the sum of its proper divisors (2516794740).

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

1234978740 is a wasteful number, since it uses less digits than its factorization.

1234978740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401 (or 10396 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 1234978740 is about 35142.2642981354. The cubic root of 1234978740 is about 1072.8849678376.

The spelling of 1234978740 in words is "one billion, two hundred thirty-four million, nine hundred seventy-eight thousand, seven hundred forty".