1401643642 has 48 divisors (see below), whose sum is σ = 2686962240. Its totient is φ = 535583232.

The previous prime is 1401643627. The next prime is 1401643651. The reversal of 1401643642 is 2463461041.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67758 + ... + 85990.

It is an arithmetic number, because the mean of its divisors is an integer number (55978380).

Almost surely, 2^1401643642 is an apocalyptic number.

1401643642 is a deficient number, since it is larger than the sum of its proper divisors (1285318598).

1401643642 is a wasteful number, since it uses less digits than its factorization.

1401643642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18295 (or 18278 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 1401643642 is about 37438.5315150047. The cubic root of 1401643642 is about 1119.1265623258.

The spelling of 1401643642 in words is "one billion, four hundred one million, six hundred forty-three thousand, six hundred forty-two".