398888537 has 4 divisors (see below), whose sum is σ = 400779216. Its totient is φ = 396997860.

The previous prime is 398888509. The next prime is 398888573. The reversal of 398888537 is 735888893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 735888893 = 37 ⋅19888889.

It is a cyclic number.

It is not a de Polignac number, because 398888537 - 2¹⁴ = 398872153 is a prime.

It is a super-2 number, since 2×398888537² = 318224129900000738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398881537) 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, 945023 + ... + 945444.

It is an arithmetic number, because the mean of its divisors is an integer number (100194804).

Almost surely, 2^398888537 is an apocalyptic number.

It is an amenable number.

398888537 is a deficient number, since it is larger than the sum of its proper divisors (1890679).

398888537 is a wasteful number, since it uses less digits than its factorization.

398888537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890678.

The product of its digits is 11612160, while the sum is 59.

The square root of 398888537 is about 19972.1940957923. The cubic root of 398888537 is about 736.1232225408.

The spelling of 398888537 in words is "three hundred ninety-eight million, eight hundred eighty-eight thousand, five hundred thirty-seven".