1390690 has 16 divisors (see below), whose sum is σ = 2860992. Its totient is φ = 476784.

The previous prime is 1390681. The next prime is 1390693. The reversal of 1390690 is 960931.

It is a happy number.

It is a super-2 number, since 2×1390690² = 3868037352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1390693) 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, 9864 + ... + 10003.

It is an arithmetic number, because the mean of its divisors is an integer number (178812).

2^1390690 is an apocalyptic number.

1390690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1390690 is an abundant number, since it is smaller than the sum of its proper divisors (1470302).

1390690 is a wasteful number, since it uses less digits than its factorization.

1390690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19881.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 1390690 is about 1179.2752011299. The cubic root of 1390690 is about 111.6203664393.

It can be divided in two parts, 1390 and 690, that added together give a triangular number (2080 = T₆₄).

The spelling of 1390690 in words is "one million, three hundred ninety thousand, six hundred ninety".