1399090 has 64 divisors (see below), whose sum is σ = 3317760. Its totient is φ = 411840.

The previous prime is 1399063. The next prime is 1399109. The reversal of 1399090 is 909931.

1399090 = T₃₆₄ + T₃₆₅ + ... + T₃₈₃.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17671 + ... + 17749.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2^1399090 is an apocalyptic number.

1399090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1399090 is an abundant number, since it is smaller than the sum of its proper divisors (1918670).

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

1399090 is a wasteful number, since it uses less digits than its factorization.

1399090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 1399090 is about 1182.8313489251. The cubic root of 1399090 is about 111.8446506942.

It can be divided in two parts, 139 and 9090, that added together give a palindrome (9229).

The spelling of 1399090 in words is "one million, three hundred ninety-nine thousand, ninety".