398121437 has 32 divisors (see below), whose sum is σ = 482549760. Its totient is φ = 321330240.

The previous prime is 398121433. The next prime is 398121461. The reversal of 398121437 is 734121893.

It is not a de Polignac number, because 398121437 - 2² = 398121433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398121437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398121431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2020823 + ... + 2021019.

It is an arithmetic number, because the mean of its divisors is an integer number (15079680).

Almost surely, 2^398121437 is an apocalyptic number.

It is an amenable number.

398121437 is a deficient number, since it is larger than the sum of its proper divisors (84428323).

398121437 is a wasteful number, since it uses less digits than its factorization.

398121437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441.

The product of its digits is 36288, while the sum is 38.

The square root of 398121437 is about 19952.9806545288. The cubic root of 398121437 is about 735.6510417714.

The spelling of 398121437 in words is "three hundred ninety-eight million, one hundred twenty-one thousand, four hundred thirty-seven".