1399970 has 48 divisors (see below), whose sum is σ = 3016440. Its totient is φ = 464640.

The previous prime is 1399963. The next prime is 1399999. The reversal of 1399970 is 799931.

1399970 = T₁₃₁ + T₁₃₂ + ... + T₂₁₉.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 644809 + 755161 = 803^2 + 869^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15686 + ... + 15774.

2^1399970 is an apocalyptic number.

1399970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1399970 is an abundant number, since it is smaller than the sum of its proper divisors (1616470).

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

1399970 is a wasteful number, since it uses less digits than its factorization.

1399970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 1399970 is about 1183.2032792382. The cubic root of 1399970 is about 111.8680951389.

The spelling of 1399970 in words is "one million, three hundred ninety-nine thousand, nine hundred seventy".