399999654 has 16 divisors (see below), whose sum is σ = 888888240. Its totient is φ = 133333200.

The previous prime is 399999653. The next prime is 399999667. The reversal of 399999654 is 456999993.

It is a junction number, because it is equal to n+sod(n) for n = 399999591 and 399999600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399999653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3703647 + ... + 3703754.

It is an arithmetic number, because the mean of its divisors is an integer number (55555515).

Almost surely, 2^399999654 is an apocalyptic number.

399999654 is an abundant number, since it is smaller than the sum of its proper divisors (488888586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399999654 is a wasteful number, since it uses less digits than its factorization.

399999654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7407412 (or 7407406 counting only the distinct ones).

The product of its digits is 21257640, while the sum is 63.

The square root of 399999654 is about 19999.9913499981. The cubic root of 399999654 is about 736.8060872822.

The spelling of 399999654 in words is "three hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred fifty-four".