1399254747 has 16 divisors (see below), whose sum is σ = 2043211392. Its totient is φ = 844728320.

The previous prime is 1399254673. The next prime is 1399254763. The reversal of 1399254747 is 7474529931.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1399254747 - 2⁸ = 1399254491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1399254747.

It is not an unprimeable number, because it can be changed into a prime (1399254047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74013 + ... + 90974.

It is an arithmetic number, because the mean of its divisors is an integer number (127700712).

Almost surely, 2^1399254747 is an apocalyptic number.

1399254747 is a deficient number, since it is larger than the sum of its proper divisors (643956645).

1399254747 is a wasteful number, since it uses less digits than its factorization.

1399254747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165258.

The product of its digits is 1905120, while the sum is 51.

The square root of 1399254747 is about 37406.6136799363. The cubic root of 1399254747 is about 1118.4904053510.

The spelling of 1399254747 in words is "one billion, three hundred ninety-nine million, two hundred fifty-four thousand, seven hundred forty-seven".