1400644 has 12 divisors (see below), whose sum is σ = 2801344. Its totient is φ = 600264.

The previous prime is 1400627. The next prime is 1400653. The reversal of 1400644 is 4460041.

1400644 = T₁₃₉ + T₁₄₀ + ... + T₂₂₂.

1400644 is an admirable number.

It is a super-2 number, since 2×1400644² = 3923607229472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 24984 + ... + 25039.

2^1400644 is an apocalyptic number.

1400644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1400644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1400644 is a wasteful number, since it uses less digits than its factorization.

1400644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50034 (or 50032 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1400644 is about 1183.4880650011. The cubic root of 1400644 is about 111.8860448091.

Adding to 1400644 its reverse (4460041), we get a palindrome (5860685).

The spelling of 1400644 in words is "one million, four hundred thousand, six hundred forty-four".