397434902 has 4 divisors (see below), whose sum is σ = 596152356. Its totient is φ = 198717450.

The previous prime is 397434847. The next prime is 397434907. The reversal of 397434902 is 209434793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 209434793 = 4349 ⋅48157.

It is a self number, because there is not a number n which added to its sum of digits gives 397434902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397434907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99358724 + ... + 99358727.

It is an arithmetic number, because the mean of its divisors is an integer number (149038089).

Almost surely, 2^397434902 is an apocalyptic number.

397434902 is a deficient number, since it is larger than the sum of its proper divisors (198717454).

397434902 is a wasteful number, since it uses less digits than its factorization.

397434902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198717453.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 397434902 is about 19935.7694107852. The cubic root of 397434902 is about 735.2279373881.

The spelling of 397434902 in words is "three hundred ninety-seven million, four hundred thirty-four thousand, nine hundred two".