1400391 has 6 divisors (see below), whose sum is σ = 2022800. Its totient is φ = 933588.

The previous prime is 1400387. The next prime is 1400411. The reversal of 1400391 is 1930041.

It is not a de Polignac number, because 1400391 - 2² = 1400387 is a prime.

It is a super-2 number, since 2×1400391² = 3922189905762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77791 + ... + 77808.

2^1400391 is an apocalyptic number.

1400391 is a deficient number, since it is larger than the sum of its proper divisors (622409).

1400391 is a wasteful number, since it uses less digits than its factorization.

1400391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155605 (or 155602 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1400391 is about 1183.3811727419. The cubic root of 1400391 is about 111.8793077001.

The spelling of 1400391 in words is "one million, four hundred thousand, three hundred ninety-one".