1400390 has 16 divisors (see below), whose sum is σ = 2542320. Its totient is φ = 555360.

The previous prime is 1400387. The next prime is 1400411. The reversal of 1400390 is 930041.

It is a super-2 number, since 2×1400390² = 3922184304200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 776 + ... + 1844.

It is an arithmetic number, because the mean of its divisors is an integer number (158895).

2^1400390 is an apocalyptic number.

1400390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1400390 is a deficient number, since it is larger than the sum of its proper divisors (1141930).

1400390 is a wasteful number, since it uses less digits than its factorization.

1400390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1400390 is about 1183.3807502237. The cubic root of 1400390 is about 111.8792810696.

The spelling of 1400390 in words is "one million, four hundred thousand, three hundred ninety".