1400644451 has 4 divisors (see below), whose sum is σ = 1474362600. Its totient is φ = 1326926304.

The previous prime is 1400644439. The next prime is 1400644459. The reversal of 1400644451 is 1544460041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1400644451 - 2¹⁰ = 1400643427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1400644459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36859046 + ... + 36859083.

It is an arithmetic number, because the mean of its divisors is an integer number (368590650).

Almost surely, 2^1400644451 is an apocalyptic number.

1400644451 is a deficient number, since it is larger than the sum of its proper divisors (73718149).

1400644451 is an equidigital number, since it uses as much as digits as its factorization.

1400644451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73718148.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 1400644451 is about 37425.1847156430. The cubic root of 1400644451 is about 1118.8605681800.

The spelling of 1400644451 in words is "one billion, four hundred million, six hundred forty-four thousand, four hundred fifty-one".