1399442690 has 16 divisors (see below), whose sum is σ = 2531787192. Its totient is φ = 556934784.

The previous prime is 1399442677. The next prime is 1399442699. The reversal of 1399442690 is 962449931.

It can be written as a sum of positive squares in 4 ways, for example, as 1399433281 + 9409 = 37409^2 + 97^2 .

It is a super-2 number, since 2×1399442690² = 3916879685188872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1399442699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353219 + ... + 357158.

Almost surely, 2^1399442690 is an apocalyptic number.

1399442690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1399442690 is a deficient number, since it is larger than the sum of its proper divisors (1132344502).

1399442690 is a wasteful number, since it uses less digits than its factorization.

1399442690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710581.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 1399442690 is about 37409.1257582959. The cubic root of 1399442690 is about 1118.5404803479.

The spelling of 1399442690 in words is "one billion, three hundred ninety-nine million, four hundred forty-two thousand, six hundred ninety".