997944007 has 4 divisors (see below), whose sum is σ = 998236800. Its totient is φ = 997651216.

The previous prime is 997943981. The next prime is 997944023. The reversal of 997944007 is 700449799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 700449799 = 7 ⋅100064257.

It is a cyclic number.

It is not a de Polignac number, because 997944007 - 2¹⁹ = 997419719 is a prime.

It is a super-2 number, since 2×997944007² = 1991784482214432098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997944097) 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, 141223 + ... + 148120.

It is an arithmetic number, because the mean of its divisors is an integer number (249559200).

Almost surely, 2^997944007 is an apocalyptic number.

997944007 is a deficient number, since it is larger than the sum of its proper divisors (292793).

997944007 is a wasteful number, since it uses less digits than its factorization.

997944007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292792.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 997944007 is about 31590.2517717096. The cubic root of 997944007 is about 999.3141987842.

The spelling of 997944007 in words is "nine hundred ninety-seven million, nine hundred forty-four thousand, seven".