997943437 has 8 divisors (see below), whose sum is σ = 1006093440. Its totient is φ = 989822400.

The previous prime is 997943431. The next prime is 997943461. The reversal of 997943437 is 734349799.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997943437 is a prime.

It is a super-2 number, since 2×997943437² = 1991782206902745938, 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 (997943431) 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, 64828 + ... + 78730.

It is an arithmetic number, because the mean of its divisors is an integer number (125761680).

Almost surely, 2^997943437 is an apocalyptic number.

It is an amenable number.

997943437 is a deficient number, since it is larger than the sum of its proper divisors (8150003).

997943437 is a wasteful number, since it uses less digits than its factorization.

997943437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14483.

The product of its digits is 5143824, while the sum is 55.

The square root of 997943437 is about 31590.2427499378. The cubic root of 997943437 is about 999.3140085233.

The spelling of 997943437 in words is "nine hundred ninety-seven million, nine hundred forty-three thousand, four hundred thirty-seven".