1994637431 has 8 divisors (see below), whose sum is σ = 2042392704. Its totient is φ = 1946944440.

The previous prime is 1994637427. The next prime is 1994637493. The reversal of 1994637431 is 1347364991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1994637431 - 2² = 1994637427 is a prime.

It is a super-2 number, since 2×1994637431² = 7957156962292559522, 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 (1994637731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52790 + ... + 82316.

It is an arithmetic number, because the mean of its divisors is an integer number (255299088).

Almost surely, 2^1994637431 is an apocalyptic number.

1994637431 is a deficient number, since it is larger than the sum of its proper divisors (47755273).

1994637431 is a wasteful number, since it uses less digits than its factorization.

1994637431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31141.

The product of its digits is 489888, while the sum is 47.

The square root of 1994637431 is about 44661.3639626019. The cubic root of 1994637431 is about 1258.7939730285.

The spelling of 1994637431 in words is "one billion, nine hundred ninety-four million, six hundred thirty-seven thousand, four hundred thirty-one".