399211949 has 4 divisors (see below), whose sum is σ = 400324320. Its totient is φ = 398099580.

The previous prime is 399211933. The next prime is 399211951. The reversal of 399211949 is 949112993.

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: 949112993 = 1039 ⋅913487.

It is a cyclic number.

It is not a de Polignac number, because 399211949 - 2⁴ = 399211933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399211849) 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, 555647 + ... + 556364.

It is an arithmetic number, because the mean of its divisors is an integer number (100081080).

Almost surely, 2^399211949 is an apocalyptic number.

It is an amenable number.

399211949 is a deficient number, since it is larger than the sum of its proper divisors (1112371).

399211949 is a wasteful number, since it uses less digits than its factorization.

399211949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112370.

The product of its digits is 157464, while the sum is 47.

The square root of 399211949 is about 19980.2890119237. The cubic root of 399211949 is about 736.3221141685.

The spelling of 399211949 in words is "three hundred ninety-nine million, two hundred eleven thousand, nine hundred forty-nine".