1390278620 has 12 divisors (see below), whose sum is σ = 2919585144. Its totient is φ = 556111440.

The previous prime is 1390278611. The next prime is 1390278641. The reversal of 1390278620 is 268720931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34756946 + ... + 34756985.

It is an arithmetic number, because the mean of its divisors is an integer number (243298762).

Almost surely, 2^1390278620 is an apocalyptic number.

1390278620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1390278620 is an abundant number, since it is smaller than the sum of its proper divisors (1529306524).

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

1390278620 is a wasteful number, since it uses less digits than its factorization.

1390278620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69513940 (or 69513938 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1390278620 is about 37286.4401626114. The cubic root of 1390278620 is about 1116.0935921388.

The spelling of 1390278620 in words is "one billion, three hundred ninety million, two hundred seventy-eight thousand, six hundred twenty".