1390634990 has 16 divisors (see below), whose sum is σ = 2503692720. Its totient is φ = 556131840.

The previous prime is 1390634981. The next prime is 1390635019. The reversal of 1390634990 is 994360931.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43205 + ... + 68175.

It is an arithmetic number, because the mean of its divisors is an integer number (156480795).

Almost surely, 2^1390634990 is an apocalyptic number.

1390634990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1390634990 is a deficient number, since it is larger than the sum of its proper divisors (1113057730).

1390634990 is a wasteful number, since it uses less digits than its factorization.

1390634990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30547.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 1390634990 is about 37291.2186714245. The cubic root of 1390634990 is about 1116.1889467169.

The spelling of 1390634990 in words is "one billion, three hundred ninety million, six hundred thirty-four thousand, nine hundred ninety".